Mortise cylinder lock



March 19, 1940. H..'.MACHINIST MORTISE CYLINDER nocx Original Filed July26, 1935 INVENTOR /'/F7R 0 LD Mn cH/N/s 7-.

ATTORNEY Patented Mar. 19; 1940 I j I I 2,194,244 I MORTISE CYLINDERLocK '1 Harold Machinist, Sunnyside, N. Y., assignor to Dudley LockCorporation,

. poration of Illinois Application July 26,

Chicago, 111., a cor- 1935,: Serial n 33-,251

newed May 18, 1937 I I 3 Claims. The present inventionrelates to locksand,

' more particularly, to pin tumbler cylinder locks.

locks are secured to doors or: other that the unauthorized Cylinder Iclosures in such manner or surreptitious removal of the cylinders,containingthe pin tumblers and thekey plugs, can

be accomplished with little difficulty, and once a cylinder isremovedirom the closure it is a very simple matter to disassemble it andby measuring the tumblers and master pins, a master key for the systemfrom which the cylinder has been taken can be easily provided.

In this manner unlawful or unauthorized entrance can tie-obtained to allof'the rooms of an apartment .house, hotel, or office building providedwith I locks of a master system. Furthermore, it is possible for anytenant to remove the cylinder and then hire a locksmith to change thepin tumbler combination of his look, thereby to preby the master I Ishownalock comprising a pin tumbler cylinder vent his look from beingopened key. a

" The object of the present invention, therefore, is to prevent theunauthorized or surreptitious removal of cylinder locks" from closurespro- 'vided therewith. I

A further object of the invention is to prevent the removal, of cylinderlocks from-their closures, except by a special key provided for thatpurpose.

' Another objector the invention is to provide a cylinder lock withmeans to prevent the unauthorizedremoval-of the look from the 010-sures, comprising interlocking means on the cylinder and on the closure,respectively, and keyoperated means effective under one condition toactuate the lock without releasingsaid interlocking means, and efiectiveunder another condition to release said interlocking means to permit theremoval of the lock from the closure,

ordinary key and the master'key, the lock or a number so that the Iwhile effective to actuate of locks of a mastered system, respectively,are

"may beremoved sessing the super-master key and, therefore,preineffective to release the interlocking means, thus necessitating theuse of a super-master key which is efiectiveto actuate the lock'and alsoto release the interlocking means so the cylinder from the closure byone possumablyauthorize'd to remove said look from the closure.

' The above objects of theinvention and other objects ancillary theretowill best be understood from the following descriptionconsidered withreferenceto the accompanying drawing forming a part of the presentspecifications.

' from the closure.

case is provided with a in the key plug and the pin tumblers positionedthereby so that the key can actuate the lock and also release theinterlocking means;

Fig. .3 is a sectional view. on the line 3--3 of Fig; 2;

Fig. i is a view partly in section of the key plug and associated partsof the present construction, showing the ordinary key effective toactuatethe look, but ineffective to release the interlocking means} 15Fig. 5 is a detail plan view of an interlocking member; Fig. 6 is afragmentary top plan view of the key plugarid associated parts. II IReferring to the drawing in detail, there is iii threaded into anopening 12 provided in the 'usual lock case M, mounted within a door orother closure it. The cylinder I Wis provided with the usualrotatable'key plug I8, pin tum- .bl'ers 2t, and the usuallock orlatchbolt actuit with the lock case it to prevent rotation of the cylindercase Iii with respect to the lock case it and thereby to prevent ,thecylinder from being unscrewed from the lock case and removed For thispurpose the lock slot or recess 25 into which the interlocking member,here shown as a dogthmay be projected. The dog 28is slidable within agroove it extending transversely in said cylinder and is provided with arack 32 adapted to mesh with a gear-tooth section 34 provided on anannular gear member 36. Said gear member surrounds the key plug 18 andis mounted for rotationwithin a peripheral groove fid provided in the.cylinder iii. The gear sleeve 36- is provided with a forwardly extendingprojection 48 adapted to be'engaged by a rearwardly extending projection42 on a sleeve M which surrounds the key plug l8 and which is mountedfor rotation within the peripheral groove 38 in the cylinder Ii].

Said-sleeve M- is provided with openings for additional pin tumblers 46which, as illustrated 5 in Fig. 4, are normally so positioned that thebreaks therein are at the outer surface of said key plug so that saidkey plug is normally free to rotate independently of the sleeve 44 andthe gear member 36 when an ordinary key or even when an ordinary masterkey is used for actuating the look. When, however, a special orsupermaster key is inserted within the key plug, as illustrated in Fig.2, the pin tumblers 46 are raised by the key and interlock the sleeve 44with the key plug l8. When said sleeve 44 is thus interlocked with thekey plug l8, rotation of the latter also effects rotation of the sleeve44 and as the result of the engagement of the projection 42 with theprojection 40 on the gear member 36, the latter is caused to rotate andthereby move the dog 28 into and out of the recess 26 depending upon thedirection of rotation thus interlocking the cylinder case i0 with theclosure 16 or releasing said interlock, respectively. In practice, whenthe locks constructed in accordance with the present invention areinstalled in the doors or other closures, the cylinders I0 are screwedinto the openings i2 and, by use of the super-master key 48, the endtumblers 46 are caused to interlock the sleeve 44 with the key plug 18,so that rotation of the key plug by the super-master key 48, in aclockwise direction, is efiective to project the interlocking member ordog 28 into the slot or recess 26. When said key 48 is removed from thekey plug I8, and an ordinary key 50 is inserted, the breaks in the pintumblers 46 are then automatically positioned at the outer surface ofthe key plug and, in that case, the key plug I8, when rotated within thecylinder, is ineffective to rotate the sleeve 46 either clockwise orcounter-clockwise, and is therefore ineffective to retract the lockingmember 28 from the slot 26. When the dog is projected into the slot 26in the case M, the cylinder H] cannot be rotated with respect to saidlock case, and it is therefore impossible to unscrew said cylinder fromthe closure. Also, since the lock case I4 is threadedly engaged by thecylinder, it is impossible to remove the lock case from the closure inwhich it is mounted. It will be understood that the lock is so designedthat the ordinary key and the ordinary master key, such as the key 50,of a master lock system are eiiective to actuate the look, but areineifective to actuate the interlocking member or dog 28, either toproject or retract the latter, and that said interlocking member can beactuated only by the use of a super-master key, such as the key 58,which will be under the control of one authorized to remove or installsuch locks.

As illustrated in Fig. 6, the projection 42 of the sleeve 44 ispositioned so that it is necessary to rotate said sleeve substantiallyone complete revolution before said projection engages the projection 48on the gear member 36, and thereby becomes effective to move said gearmemberto project the dog into the recess. When the dog is thus projectedand the super-master key is withdrawn from the key plug, the tumblerpins are forced down by the driver pins and interlock the key plug 18,the sleeve 44, and the cylinder, thereby to prevent forcing of the dogout of the recess in the closure. When the ordinary key or ordinarymaster key is used to actuate the lock, the tumbler pins 46 as well asthe tumbler pins 2!! are raised so that their breaks OCCLU. at

the outer surface of the key plug 18 and thus perinit rotation of thekey plug to actuate the lock without, however, actuating the sleeve 44which remains locked to the cylinder I 6 by the driver pins. In order towithdraw the dog from its recess when the key plug is actuated by thesupermaster key, the sleeve 44 clutched to said key plug is rotatedsubstantially one complete revolution in the opposite direction beforethe projection 42 engages the projection 40 on the gear member 36 andthereby becomes effective to actuate said gear member to withdraw thedog from the closure recess 26, and when the super-master key iswithdrawn, the lock is in normal position to be removed from the closureby merely unscrewing the cylinder.

Thus it is seen that the construction herein shown and described is welladapted to accomplish the several objects of the present invention. Itwill be understood, however, that the present construction may be variedand that the invention may be embodied otherwise than as here shown.,Therefore, I do. not Wish to be limited to the precise constructionsherein disclosedexcept as may be required by the appended claims and theprior art.

Having thus described my invention, what I desire to secure and claim byLetters Patent of the United States is:

1. In a pin-tumbler look, a pin-tumbler cylinder, a key plug rotatablein said cylinder, a dog mounted in said cylinder for movementtransversely thereof, said dog having a rack, a rotatable gear sleeve inmesh with said rack, a rotat able pin tumbler sleeve adapted to engagesaid gear sleeve normally inoperative by said key plug but effectiveunder a predetermined condition to be rotated thereby for engaging saidgear sleeve in order to rotate thelatter and thereby move said dog.

2. In a pin-tumbler lock, a cylinder, a key plug rotatable in saidcylinder, a sleeve surrounding said key plug and also rotatable in saidcylinder and provided with a projection, a gear member surrounding saidplug rotatable within said cylinder and provided with a projectionadapted to be engaged by said sleeve projection, said plug be ingnormally rotatable independently of said sleeve and gear, meansoperative to clutch said sleeve to said plug to rotate said sleeve whenthe plug is rotated, thereby to engage said sleeve projection with saidgear projection and rotate said rack, and a dog mounted on said cylinderfor movement transversely thereof provided with a rack in mesh with saidgear whereby actuation of said sleeve is effective to move said dog withrespect to said cylinder,

3. In a pin-tumbler look, a pin-tumbler cylinder, a key plug rotatablein said cylinder, a dog mounted in said cylinder for movementtransversely thereof, said dog having a rack, a rotatable gear sleeve inmesh with said rack, a rotatable pin tumbler sleeve adapted to engagesaid gear-sleeve normally inoperative by said key plug but effectiveunder a predetermined condition to be rotated thereby for engaging saidgear sleeve in order to rotate the latter and thereby move said dog,said pin-tumbler sleeve having a lost .motion connection with said gearmember and effective, after actuation by said key plug to rotate thegear member in one direction to move the dog, to remain in position toprevent move- -ment of the gear member in the opposite direc-

